| 摘要 |
PURPOSE:To increase an industrial value as a wrapping material by improving a barrier property by a method wherein a specific polyolefin resin is in a filmy state extruded from a die within a specific range in temperature to an inorganic oxide film on a base material, and time in contact with air is controlled within a specific range in that case. CONSTITUTION:As an inorganic oxide film 4 composing a base material 2, oxide films of Mg, Si, Al, etc., are exemplified. A molten filmy polyolefin resin is extruded within a range of 260 deg.C-310 deg.C from a die 12 on to the film surface. Time in contact with air in that case is restrained within a range of 0.05-0.2sec. As the polyolefin resin to be used, low density polyethylene, ethylene vinyl acetate copolymer, ethylene-acrylate copolymer, etc., are exemplied. Since conditions wherein they are molten and extruded from the die 12 are as above mentioned above, when the polyolefin resin is laminated on the inorganic oxide film of the base material supplied from an unwinder 15, the number of carbonyl groups per 10000C thereof becomes at least 5 groups. |
